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McKenney" , Mahesh J Salgaonkar , Oliver O'Halloran , Kai-Heng Feng , Keith Busch , Robert Richter , Terry Bowman , Shiju Jose , Dave Jiang , linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, Bjorn Helgaas , Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= Subject: Re: [PATCH v7 02/17] PCI/DPC: Log Error Source ID only when valid Message-ID: <20250521192352.GA1430719@bhelgaas> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20250521100035.0000544e@huawei.com> On Wed, May 21, 2025 at 10:00:35AM +0100, Jonathan Cameron wrote: > On Tue, 20 May 2025 16:50:19 -0500 > Bjorn Helgaas wrote: > > > From: Bjorn Helgaas > > > > DPC Error Source ID is only valid when the DPC Trigger Reason indicates > > that DPC was triggered due to reception of an ERR_NONFATAL or ERR_FATAL > > Message (PCIe r6.0, sec 7.9.14.5). > > > > When DPC was triggered by ERR_NONFATAL (PCI_EXP_DPC_STATUS_TRIGGER_RSN_NFE) > > or ERR_FATAL (PCI_EXP_DPC_STATUS_TRIGGER_RSN_FE) from a downstream device, > > log the Error Source ID (decoded into domain/bus/device/function). Don't > > print the source otherwise, since it's not valid. > > > > For DPC trigger due to reception of ERR_NONFATAL or ERR_FATAL, the dmesg > > logging changes: > > > > - pci 0000:00:01.0: DPC: containment event, status:0x000d source:0x0200 > > - pci 0000:00:01.0: DPC: ERR_FATAL detected > > + pci 0000:00:01.0: DPC: containment event, status:0x000d, ERR_FATAL received from 0000:02:00.0 > > > > and when DPC triggered for other reasons, where DPC Error Source ID is > > undefined, e.g., unmasked uncorrectable error: > > > > - pci 0000:00:01.0: DPC: containment event, status:0x0009 source:0x0200 > > - pci 0000:00:01.0: DPC: unmasked uncorrectable error detected > > + pci 0000:00:01.0: DPC: containment event, status:0x0009: unmasked uncorrectable error detected > > > > Previously the "containment event" message was at KERN_INFO and the > > "%s detected" message was at KERN_WARNING. Now the single message is at > > KERN_WARNING. > > > > Signed-off-by: Bjorn Helgaas > > Tested-by: Krzysztof Wilczyński > > Reviewed-by: Kuppuswamy Sathyanarayanan > Matches the spec conditions as far as I can tell. > > I guess interesting debate on whether providing extra garbage info is > a bug or not. Maybe a fixes tag for this one as well? I added: Fixes: 26e515713342 ("PCI: Add Downstream Port Containment driver") since it looks like we've printed the source unconditionally since the addition of DPC: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/pci/pcie/pcie-dpc.c?id=26e515713342#n69 > Reviewed-by: Jonathan Cameron > > I briefly wondered if it makes sense to have a prefix string initialized > outside the switch with "containment event, status:%#06x:" > made sense but it's probably not worth the effort and maybe makes it > harder to grep for the error messages. So in the end > I think your code here is the best option. > > Jonathan